#1. Edit Event > Add a “TBC” text in Excerpt.

#2. Use Monospace for this text

#3. Use this code to Code Injection – Footer (or Event Page Header Code Injection)
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$('.eventlist-excerpt pre code:contains("TBC")').closest('.eventlist-event').addClass('tbc-event');
});
</script>
<style>
.eventlist-excerpt pre {
display: none;
}
.tbc-event .eventlist-datetag>div:after {
content: "TBC";
position: absolute;
font-size: 20px;
top: 50%;
left: 50%;
transform: translate(-50%,-50%);
}
.tbc-event .eventlist-datetag>div>div {
opacity: 0;
}
</style>

#4. Result
